乙型鏈球菌（Group B Streptococcus）引起健康成人化膿性關節炎（septic arthritis）

Group B Streptococcus-Induced Septic Arthritis in Healthy Adults

一名58歲女性無慢性病史，因左肩膀紅腫疼痛前來就醫，血液常規檢查顯示白血球、CRP、ESR升高。抽取關節液做鏡檢與細菌培養，其細胞計數結果：白血球達38880×10/μl，血球分類結果嗜中性白血球=85%；淋巴球=11%；單核球=4%，格蘭氏染色結果發現格蘭氏陽性鏈球菌，經細菌培養鑑定為乙型鏈球菌，證實為乙型鏈球菌引起化膿性關節炎。結論是：乙型鏈球菌引起健康成人化膿性關節炎的案例雖然少見，但有逐漸增加的趨勢，值得臨床醫師重視，作為調整抗生素經驗療法的參考。

A woman aged 58 years without any history of chronic conditions sought medical attention for red, swollen, and painful left shoulder. Her routine blood test results revealed increased white blood cells, C-reactive protein, and erythrocyte sedimentation rate. Her synovial fluid was obtained for microscopy and bacterial culture, and the cell count result was as follows: WBC count = 38880×10/μl and Neutrophil＝85%, Lymphocyte＝11%, Monocyte＝4%. The Gram stain revealed Gram-positive coccus in chain, which was verified through culture to be Group B Streptococcus; therefore, the shoulder pain was caused by Group B Streptococcus–induced septic arthritis. Conclusions: Group B Streptococcus–induced septic arthritis in healthy adults, despite rare, is shown to be an increasing trend and thus requires the attention of clinical doctors, to whom the study results may provide insight into adjusting their empiric antibiotic therapy.